Grinding machine



y 1934- F. CHATEAUNEUF 7 GRINDING MACHINE Filed June 26, 1931 I N V ENTOR. I Fran/f Chateau/7a? aw/7 7M A A TTORNE Y.

Patented May 8, 1934 UNITED STATES PATENT OFFICE 4 Claims.

The invention relates to grinding machines especially adapted forgrinding distribution contacts commonly used in ignition systems forhydrocarbon engines suitable for self-propelled vehicles. The inventionconsists of a semi-automatic device for adjusting the contact member tothe stone and for adjusting the stone to the contact member. Theinvention further consists of horizontally adjusting the stone and frameto various sizes of contact frames.

The object of the invention is to provide a grinding machine havingsemi-automatic adjusting devices for the various members so the operatorof the machine can concentrate on the member to be adjusted whilesprings will move the members in one direction and the operator willmove them in the opposite direction with ease and accuracy to obtain aperfect grinding adjustment. Under the present condition car owners andothers have great trouble in keeping the contacts in good condition andit is to obviate this difiiculty by devising a machine which can be usedby anyone, either skilled or unskilled in the art, to obtain a'smoothsurface on the contacts.

Referring to the figures.

Figure 1 shows a front elevation of the machine.

Figure Figure Figure same.

Figure 5 shows a longitudinal cross section through the machine.

Figure 6 shows a traverse section through the frame for supporting thegrindstone.

Figure '7 shows an under plan view of the contact to be ground with theframe broken away.

Figure 8 is a side elevation of the same partly broken away showing thedefect in the contact to be ground. V

Figure 9 is a side elevation of the contact member located in positionon the grindstone.

Referring to the drawing which illustrates my 2 shows a side elevationof the same. 3 shows a plan view of the same. 4 shows an opposite endview of the new grinding machine, having a base 10 for supporting theoperating members. Formed integral with the base 10 are two verticalcolumns 11 and 12 respectively which support the holder for the contactmember 13 to be ground and the grindstone 14. The machine is especiallyadapted for grinding distributor contacts commonly used in ignitionsystems for hydrocarbon engines used to drive self-propelled vehicles.The

. contact member 13 is secured to the holder 15 which is supported onthe shaft 16 having bearings l7 and 18 in the swinging head 19. Theholder 15 is free to swing on the shaft 16 and the swinging head 19 isfree to turn on the vertical stationary shaft 20. This allows auniversal movement for the grinding operation and for adjusting thecontact member 13 to the stone 14. The vertical shaft 20 is adjustablein the hole 21 machined in the vertical column 11. Machined on the shaft20 is a fiat surface 22 which permits the setscrew 23, threaded into the001- umn 11, to hold the shaft 20 in the adjusted position. The setscrewis provided with a butterfly head to facilitate the operation. This typeof setscrew is used throughout the machine. Located in the hole 21 is aspring 24 held normally under compression by the shaft 20 for forcingthe shaft 20 upwardly when the setscrew 23 is released. By thisconstruction the contact 13 and the contact frame 15 can be adjustedinproper relation to the grindstone 14. That is, when the shaft is free tomove upwardly by the action of the spring 24 the operator can adjust thehead 19 until the contact 13 is fiat against the stone 14 when thegrinding operation takes place. If the contact is uneven so that it willnot lay flat against the stone a new contact can be used temporarily foradjustment and then removed and the defective contact can be reset forthe operation. 1

When the contact frame 15 is placed in position on the shaft 16 it islocked by the cam plate 25 entering the slot 26 cut in the shaft 16. Thecam plate 25 is thenlockecl by the setscrew 27. The numeral 28 indicatesa small hole for allowing another size shaft to be used for differentcontact frames.

The grindstone 14 can be adjusted and leveled to the contact member 13by novel devices as shown in Figure 6. The stone 14 is supported in aframe 29 which in turn is supported by the column 12. The stone 14 isheld in position between the. wall 30 and the upwardly extendingprojections 31 and 32 forming a part of the frame 29. The stone ispadded with cloth material so the pressure will not break the stone.After the stone is placed in position it is held rigidly by a setscrew33. The surface 34 is slanting in relation to the frame 29 and the stonerests partly on the surface and partly on the adjustable screw 35. Theend of the stone resting on the surface 34 is held by a clamp 36 whichis rigidly secured in position to the frame 29 by the setscrew 3'7. Thesetscrew 35 is threaded into the boss formed integral with the frame 29and to adjust the stone the setscrew is turned downwardly allowing thespring 38 to press against the stone and force it upwardly allowingsufficient play for the stone to be adjusted manually. When the stone isadjusted it is securely fastened by the setscrew 33 at which time thescrew 35 is moved upwardly under the stone to provide a rigid support.

The stone can be adjusted to different lengths of contact frame byturning the setscrew 39, which is threaded into the frame 29 and extendsthrough the slot 40. The slot allows for horizontal adjustment by handin one direction and the spring 42 in the opposite direction. That is,the frame can be adjusted by unfastening the setscrew 39 and by turningthe setscrew 41 it will force the frame inwardly to change the positionof the stone in relation to the contact member. To adjust the frame inthe opposite direction the screw is turned in the relative direction andthe spring 42 forces the frame outwardly in accordance with the movementof the setscrew. The setscrew 39 is reset and the frame is held rigidlyin the operating position. In operation the contact member and theframes of various sizes can be placed in the machine for grinding thecontact member 13 on the stone 14 by a swinging movement. The contactframe 15 is free to swing on the shaft 16 and can be taken out or placedin position at the will of the operator by removing the cam lock 25 fromthe slot 26, or vice versa. The operator then turns the setscrew 23 awayfrom the shaft 20 which allows the spring 14 to force it upwardly inposition to adjust the contact 13 to be ground on the stone 14. Theadjustment is made by the spring 24 in one direction and by hand in theopposite direction by locating the swinging head 19 in the properposition.

The grindstone 14 can be adjusted or leveled to the surface of thecontact 13 by placing the stone under the clamp 36 on the surface 34which is inclined to allow the stone to be adjusted from the oppositeend by the spring 38 in one direction and by hand in the oppositedirection. After the stone is adjusted it is supported by the setscrew35 and clamped rigidly in position by the setscrew 33.

The stone 14 and the frame 29 can be adjusted horizontally to allow fordifierent sizes of contact frames. The frame 29 is held in position bythe setscrews 39 and 41 by relieving the pressure of the setscrews theframe can be adjusted by the spring 42 in one direction and by hand inthe opposite direction within the length of the slot 40. The operationsof the machine allow certain adjustments by springs in one direction andby hand in the opposite direction which permits accurate adjustmentbecause the operator can concentrate on his adjusting and. the springand hand will determine the movement without detracting his attentionfrom the member to be adjusted.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

l. A grinding machine having a base and column support integral with thebase for the member to be ground, a column support integral with thebase for the grindstone, said column support having a hole therein, ashaft in the hole, a swinging head for supporting the member to beground, a spring in the hole in the column under the shaft for adjustingthe shaft in one direction and free to be manually operated in theopposite direction, a set screw for holding the shaft in position afterit is adjusted.

2. A grinding machine having a base, a column, integral with the basefor supporting the member to be ground, a second column integral withthe base, a frame supported by the second column, abutment surfacesformed on the frame, an inclined surface formed in the frame forsupporting the stone at one end, a spring for adjusting the stone in onedirection and free to be manually adjusted in the opposite direction, anadjustable setscrew concentric with the spring for supporting thegrindstone after it is adjust ed, a setscrew threaded into the frame forholding the grindstone rigidly in position against the abutments afterit has been adjusted.

3. A grinding machine having a base, a column integral with the base forsupporting the member to be ground, a second column integral with thebase, a frame supported by the second column, abutment surfaces formedon the frame, an inclined surface formed in the frame for supporting thestone at one end, a spring for adjusting the stone in one direction andfree to be manually adjusted in the opposite direction, an ad justablesetscrew concentric with the spring for supporting the grindstone afterit is adjusted, a setscrew threaded into the frame for holding thegrindstone rigidly in position against the abutments after it has beenadjusted, and means for horizontally adjusting the frame and stone inrelation to the member to be ground.

4. A grinding machine having a base, a column integral with the base forsupporting the member to be ground, a second column integral with thebase, a frame supported by the second column, abutment surfaces formedon the frame, an inclined surface is formed in the frame for supportingthe stone at one end, a spring for ad justing the stone in one directionand free to be manually adjusted in the opposite direction, anadjustable setscrew concentric with the spring for supporting thegrindstone after it is adjusted,

a setscrew threaded into the frame for holding 173 the grindstonerigidly in position against the abutments after it has been adjusted, aprojection integral with the frame, a slot in the projection, a setscrewthreaded into the column structure to allow the frame to be adjustedhori- J zontally, a downwardly extended projection integral with theframe, a setscrew extending loosely through a hole in the projection andthreaded into the column structure for adjusting the frame horizontallyin one direction, a spring concentric with the setscrew abutting againstthe column structure and the projection on the frame for adjusting theframe in the opposite direction.

FRANK CHATEAUNEUF.

